Combining Texts

You have chosen 'Katzav on limitations of dispositions' by Brian Ellis, 'Existence,Ontological Commitment and Fictions' by Peter van Inwagen and 'Many, but almost one' by David Lewis

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All the ideas for Science, or select a subheading:
      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation